Like lambs to a slaughter suggests that the slugs (much like the sheep) have no idea that death comes soon, for the slugs either the birds will get them, they get dried out(?), or they risk being found by a human. For the sheep, they’re happy because they have an unlimited supply of food and they’re happy, but they’re being led to their deaths.
The right answer for the question that is being asked and shown above is that: "a. Most people seek to avoid death, but the old man looks for it." The ironic about the attitude that the old man has toward Death is that <span>a. Most people seek to avoid death, but the old man looks for it.</span>